dmraid: command not found

Maybe Your $PATH variable doesn't contain the default paths? echo $PATH should give something like:

[root@server ~]# echo $PATH
/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin

If it's empty, You may set the PATH variable with this command

export PATH="/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin"

On CentOS possible default full paths are:

/sbin/dmraid - from package: dmraid

You may install the required package with command yum install {package}

On Debian possible default full paths are:

/sbin/dmraid - from package: dmraid

You may install the required package with command apt-get install {package}

Error in other languages:
dmraid: bevel nie gevind nie
dmraid: comandă negăsită
dmraid: comando não encontrado
dmraid: commande introuvable
dmraid: command not found
dmraid: käsku ei ole
dmraid: không tìm thấy lệnh
dmraid: komanda nerasta
dmraid: Kommando nicht gefunden.
dmraid: kommandot finns inte
dmraid: komut yok
dmraid: nie znaleziono polecenia
dmraid: níor aimsíodh an t-ordú
dmraid: no se encontró la orden
dmraid: no s'ha trobat l'ordre
dmraid: opdracht niet gevonden
dmraid: parancs nem található
dmraid: perintah tidak ditemukan
dmraid: príkaz nenájdený
dmraid: příkaz nenalezen
dmraid: команда не найдена
dmraid: командата не е открита
dmraid: 命令找不到
dmraid: コマンドが見つかりません